Zachary K. Tittle, 19, and Lori E. Tucker, 20, both of 577 Woodlyn Road, were arrested on aggravated robbery charges Tuesday.

Two others — John M. Watson, 20, and Christa L. Bailey, 20, both of 160 Guinn Lane, Erwin — were already in custody.

The robbery happened July 27 after when Lisa Yates and another woman were in a vehicle with the four people now charged.

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